Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 30, NWS Kansas City, MO

June 11, 20216 counties in Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Jun 11, 2021, 4:14 PM CDT for 6 counties in Missouri. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 11, 2021, 4:14 PM CDT (21:14 UTC)
Expired: Jun 11, 2021, 5:00 PM CDT
In force: 46 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 80.0 mph

Counties Cass County, MO, Clay County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Ray County, MO

The radar

The Pleasant Hill radar (KEAX), 29 km from the middle of the area, began a volume at 21:15 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jun 11, 4:30 PM CDT	TSTM WND DMG	Harrisonville, MO	REPORT OF ROOF DAMAGE TO CHURCH. MEDIA VIDEO SHOWED LARGE SECTION OF ROOF BLOWN OFF. TIME ESTIMATED VIA RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 11, 12:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 9.2 hours before the alert went out and 138 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2135 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.2

Open this sounding in Storm Lab

The text

As transmitted.

991 
WUUS53 KEAX 112114
SVREAX
MOC037-047-095-101-107-177-112200-
/O.NEW.KEAX.SV.W.0030.210611T2114Z-210611T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
414 PM CDT Fri Jun 11 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Northern Cass County in west central Missouri...
  Southeastern Clay County in west central Missouri...
  Southern Ray County in west central Missouri...
  Lafayette County in west central Missouri...
  Jackson County in west central Missouri...
  Western Johnson County in west central Missouri...

* Until 500 PM CDT.

* At 413 PM CDT, a severe thunderstorm was located near Odessa,
  moving southeast at 25 mph.

  This is a very dangerous storm.

  HAZARD...80 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely.

* This severe thunderstorm will be near...
  Odessa around 420 PM CDT.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 11 and 58.
 Interstate 470 between mile markers 4 and 16.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3857 9453 3902 9448 3927 9426 3935 9387
      3924 9375 3921 9376 3921 9372 3902 9353
      3863 9400
TIME...MOT...LOC 2113Z 320DEG 24KT 3898 9407 

HAIL...1.25IN
WIND...80MPH
 
$$

PP

2 follow-up statements

560 
WWUS53 KEAX 112138
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
438 PM CDT Fri Jun 11 2021

MOC047-112148-
/O.CAN.KEAX.SV.W.0030.000000T0000Z-210611T2200Z/
Clay MO-
438 PM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CLAY COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
north central and west central Missouri.

LAT...LON 3857 9453 3899 9448 3910 9423 3918 9403
      3921 9376 3921 9372 3902 9353 3863 9400
TIME...MOT...LOC 2138Z 320DEG 24KT 3885 9393 

$$

MOC037-095-101-107-177-112200-
/O.CON.KEAX.SV.W.0030.000000T0000Z-210611T2200Z/
Cass MO-Ray MO-Lafayette MO-Jackson MO-Johnson MO-
438 PM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR NORTHERN CASS...SOUTHEASTERN RAY...LAFAYETTE...SOUTHEASTERN
JACKSON AND WESTERN JOHNSON COUNTIES...

At 438 PM CDT, a severe thunderstorm was located 7 miles southwest of
Oak Grove, moving southeast at 30 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

This severe thunderstorm will remain over mainly rural areas of
northern Cass, southeastern Ray, Lafayette, southeastern Jackson and
western Johnson Counties, including the following locations...
Fayetteville, Unity Village, Bates City, Tarsney Lakes, Gunn City,
Pittsville, Aullville, La Tour, Lake Lafayette and Strasburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3857 9453 3899 9448 3910 9423 3918 9403
      3921 9376 3921 9372 3902 9353 3863 9400
TIME...MOT...LOC 2138Z 320DEG 24KT 3885 9393 

HAIL...0.88IN
WIND...70MPH
 
$$

PP

116 
WWUS53 KEAX 112158
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
458 PM CDT Fri Jun 11 2021

MOC037-095-101-107-177-112208-
/O.EXP.KEAX.SV.W.0030.000000T0000Z-210611T2200Z/
Cass MO-Ray MO-Lafayette MO-Jackson MO-Johnson MO-
458 PM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CASS...SOUTHEASTERN
RAY...LAFAYETTE...SOUTHEASTERN JACKSON AND WESTERN JOHNSON COUNTIES
WILL EXPIRE AT 500 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds and heavy rain are still
possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
north central and west central Missouri.

LAT...LON 3857 9453 3899 9448 3910 9423 3918 9403
      3921 9376 3921 9372 3902 9353 3863 9400
TIME...MOT...LOC 2158Z 320DEG 24KT 3875 9382 

$$

PP

The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 12:04 PM CDT	Special Weather Statement	EAX	Atchison	41 min
Jun 11, 12:10 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt	21 min
Jun 11, 1:16 PM CDT	Severe Thunderstorm Warning	EAX	Holt	29 min
Jun 11, 1:41 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, Holt	34 min
Jun 11, 2:12 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, DeKalb, Holt, Platte	63 min
Jun 11, 2:44 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, Clay, Clinton, DeKalb, Platte	46 min
Jun 11, 2:49 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Lafayette, Ray	41 min
Jun 11, 2:52 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton, Jackson, Platte	68 min
Jun 11, 3:26 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Clay, Clinton, Jackson, Ray	34 min
Jun 11, 3:28 PM CDT	Special Weather Statement	EAX	Lafayette	47 min
Jun 11, 3:37 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson, Lafayette, Ray	38 min
Jun 11, 3:57 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton, Jackson, Ray	14 min
Jun 11, 3:59 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson	31 min
Jun 11, 4:02 PM CDT	Areal Flood Advisory	EAX	Platte	4 hr
Jun 11, 4:07 PM CDT	Special Weather Statement	EAX	Pettis	38 min
Jun 11, 4:25 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Lafayette, Pettis, Saline	35 min
Jun 11, 4:42 PM CDT	Severe Thunderstorm Warning	EAX	Bates, Cass, Henry, Johnson, Pettis	33 min
Jun 11, 5:08 PM CDT	Severe Thunderstorm Warning	EAX	Henry, Johnson, Lafayette, Pettis, Saline	37 min
Jun 11, 5:58 PM CDT	River Flood Warning	EAX	Jackson	81 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.